CORRESPONDENCE ON BUENOS AIRES WESTERN RAILWAY TUNNELS UNDER THE CITY OF BUENOS AIRES.

Keywords: RAILWAYS, TUNNELS, CITIES, UNDERGROUND, LININGS, COSTS, TUNNELLING, GOODS, CAST, IRON, WATERPROOFING, SUBURBAN, TRAFFIC, PASSENGERS, MATERIALS, SOFT, ROCKS, CONCRETE, BUENOS AIRES, ARGENTINA, SOUTH AMERICA